[issue40016] Clarify flag case in `re` module docstring

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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title: Clarify flag case in `re` module -> Clarify flag case in `re` module docstring

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40016>
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